Engine-cylinder dresser



0. STROBERGER AND R. E. LEE. ENGINE CYHNDER DRESSER.

APPLICATION FILED NOV. 1, I920. 1,3 9, 50, PatentedSept. 6,1921.

2 SHEETS-SHEET 1.

I 01122 ,jil'aayal and 0. STROBERGER AND RLE. LEE. EN GINE CYLINDERDRESSER.

APPLICATION FILED NOV 1, 1920. 1,389,850. PatentedSept. 6, 1921.

2 SHEETS-SHEET 2.

Y/( 'II. WM

. UNITED STATES PATENT OFFICE.

OTTO STROB ERGER AN D REZIE E. LEE, 0F GREIGH'I'ON, NEBRASKA.

ENGINE-CYLINDER DRESSER.

Specification of Letters Patent.

Patented Sept. 6, 1921.

Application filed. November 1, 1920. Serial No. 421,016.

To all whom it may concern:

Be it known that we, Or'ro S'rnoBnRoER and Rnzrn E. LEE, citizens of theUnited States, and residents of Creighton, in the county of Knox andState of Nebraska, have invented a new and useful Improvement inEngine-Cylinder Dressers, of which the following is a specification.

Our invention relates to engine cylinder dressers or finishers and hasas its all important object the provision of a device which may bereadily inserted in the engine cylinder and efiectively lap or finishthe interior thereof.

Further, the invention provides a rotatable cylinder lapper or finisherwhich ineludes a pair of complementary semi-cylindrical sectionsprovided with means for holding an abrasive sheet thereon which will beheld firmly at all times against the inner walls of the cylinder duringthe rotation of the device.

The invention also provides a rotatable abrasive holder including a pairof semicylindrical sections resiliently moved away from each other tohold the abrasive material in working position against the inner face ofthe cylinder.

The invention also provides a device of this character which may be usedin con junction with any conventional type of rotating tool holder.

With the preceding and other objects and advantages in mind that willbecome apparent from the following disclosure, the invention consists inthe novel combination of elements, and arrangements of parts andoperations to be hereinafter specifically referred to, claimed andillustrated in the accompanying drawings, wherein:

Figure l is a side elevation of the device in operation, parts of theengine being operated on, being shown in cross section.

Fig. 2 is an end elevation of the device.

Fig. 3 is an enlarged side elevation of the device detached from therotating tool holder.

Fig. 4. is a sectional view taken on line 4-4 of Fig. 2.

Fig. 5 is a perspective of one of the elements embodied in thecombination.

Referring in detail to the drawings, where in similar characters ofreference designate corresponding parts throughout the several views,the numeral 5 designates a conventional type of lathe or other metalworking machine and includes a rotatable tool holder 6.

()ur improved cylinder dresser or lapper, as reduced to practice,consists of a pair of complementary semi-cylindrical abrasive holders orsections 6 upon the inner face of each of which is a boss '7 providedwith a recess 8. A pin 9 extends transversely from one section to theother and has its ends engaged in the recesses 8. The ends of this pin 9stop short of the end walls of the recesses 8 so that the sections 6 maybe moved laterally toward each other. The numeral 10 designates a shankhaving one end secured in the rotating chuck or tool holder 6 and hasits opposite end formed with an eye 11, which is disposed on the pin 9.Centrally of its end and held in this position by a set screw 12,encircling the pin 9 and located upon opposite sides of the eye 11 arecoil springs 13, the inner end of each of which bears against this eye11 while its opposite ends bear against the adjacent boss 7 and therebyurges the sections 6 away from each other.

As shown in Figs. 2 and 3, the sections 6 are formed with, upon theirouter faces and at their lon itudinal edges, longitudinal recesses l4.isposed upon the outer face of each of the sections 6 is a sheet ofemery cloth or other abrasive material 15. One end of each of thesesheets is disposed in one of the recesses 14. and is held therein byclamping bars 16, the latter being detach-ably held in the recess 14 byfastenings 17. The opposite ends of each of these sheets 15 is held inthe other recess of their respective sections by a resilient clampingbar 18 having its ends formed with clips 19 engaging the notches 20located at the ends of the section 6.

In order to limit the outward movement of the sections 6, when the sameare not en gaged within the cylinder, there is provided a pair oflongitudinally curved plates 21 which are secured to the inner face ofthe sections at their longitudinal edges by fastenings 252. One end ofthese plates is provided with a longitudinal slot through which pins orscrews 24-, carried tion 6, extend.

in operation, the sections 6 are moved. toward each other to permit thesame to bs received in the cylinder of the engine. it asmuch as thesesections 6 are under he i finance of the springs 9, they are urged awaychuck or from each other and resiliently hold the abrasive sheetsagainst the inner face of the cylinder.

It is to be understood that the form of our invention herein shown anddescribed is to be taken as a preferred example of the same, and thatvarious changes in the shape, size and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the subjoined claim.

Having thus described our invention, what we claim as new 'and desire tosecure and rotect by Letters Patent of the United States, is:

A device of the character described, comprising a pair of complementarysemi-cylindrical sections each of which being PI'OXlClQd with a recessin its inner face and located atdiametrically opposite points, saidsections being also provided with longitudinal recesses upon their outerfaces and at their longitudinal edges, abrasive sheets embrac ing theouter faces of the sections and having their ends disposed in therecesses, clamping bars holding one end of each sheet in position, andresilient clips disposed in the, other recesses and holding the oppositeends of the sheets in place, a pin having its ends engaged in therecesses, a shank adapted to be connected with a rotating tool andprovided with an eye at one end through which the pin extends and haspositive connectionv therewith, coil springs on the pin bearing againstthe eye and sections to urge the latter away from each other, platescarried by the inner face of each section, each of which being providedwith a slot, and a pin. carried by each section and engaged in the slot.

OTTO STROBERGER. REZIE E. LEE.

